﻿using Microsoft.AspNetCore.Mvc.ApplicationModels;
using Microsoft.AspNetCore.Mvc.Routing;

namespace PhysicalExamination5.WebApi.Utility.Route
{
    /// <summary>
    /// 全局路由前缀配置
    /// </summary>
    public class RouteConvention : IApplicationModelConvention
    {
        /// <summary>
        /// 定义一个路由前缀变量
        /// </summary>
        private readonly AttributeRouteModel _centralPrefix;

        /// <summary>
        /// 调用时传入指定的路由前缀
        /// </summary>
        /// <param name="routeTemplateProvider"></param>
        public RouteConvention(IRouteTemplateProvider routeTemplateProvider)
        {
            _centralPrefix = new AttributeRouteModel(routeTemplateProvider);
        }


        /// <summary>
        /// 接口的Apply方法,在这个方法中根据情况来添加api的路由前缀
        /// </summary>
        /// <param name="application"></param>
        /// <exception cref="NotImplementedException"></exception>
        public void Apply(ApplicationModel application)
        {
            //遍历所有的Controller
            foreach (var controller in application.Controllers)
            {
                //1.已经标记了 RouteAttribute 的 controller
                //这一块需要注意,如果控制器中已经标注有路由了，则会在路由的前面再添加指定的路由内容
                var matchedSelectors = controller.Selectors.Where(x => x.AttributeRouteModel != null).ToList();
                if (matchedSelectors.Any())
                {
                    foreach (var selectorModel in matchedSelectors)
                    {
                        //在 当前路由上 再 添加一个路由前缀
                        selectorModel.AttributeRouteModel = AttributeRouteModel.CombineAttributeRouteModel(_centralPrefix, selectorModel.AttributeRouteModel);
                    }
                }
                //2.没有标记 RouteAttribute 的controller
                var unmatchedSelectors = controller.Selectors.Where(x => x.AttributeRouteModel == null).ToList();
                if (unmatchedSelectors.Any())
                {
                    foreach (var selectorModel in unmatchedSelectors)
                    {
                        //添加一个路由前缀
                        selectorModel.AttributeRouteModel = _centralPrefix;

                    }
                }



            }
        }
    }
}
